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Proofgold Proof
pf
Let x0 of type
ο
be given.
Let x1 of type
ο
be given.
Let x2 of type
ο
be given.
Let x3 of type
ο
be given.
Assume H0:
x2
.
Apply orIL with
or
(
or
x0
x1
)
x2
,
x3
.
Apply or3I3 with
x0
,
x1
,
x2
.
The subproof is completed by applying H0.
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